mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
0e561a2aea
This commit contains a series of fixes for DMA. The burst length patch significantly improves Ethernet performance. Patches were tested on the xRX200 and xRX330. Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
42 lines
1.6 KiB
Diff
42 lines
1.6 KiB
Diff
From 7d9ea9052d6680d2910b8b005c397d95b3a8b012 Mon Sep 17 00:00:00 2001
|
|
From: Aleksander Jan Bajkowski <olek2@wp.pl>
|
|
Date: Wed, 7 Apr 2021 21:04:39 +0200
|
|
Subject: [PATCH 3/5] MIPS: lantiq: dma: fix burst length for DEU
|
|
|
|
The current definition of 2W burst length is invalid.
|
|
This patch fixes it. Current downstream DEU driver doesn't
|
|
use DMA. An incorrect burst length value doesn't cause any
|
|
errors. This patch also adds other burst length values.
|
|
|
|
Fixes: dfec1a827d2b ("MIPS: Lantiq: Add DMA support")
|
|
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
|
|
---
|
|
arch/mips/lantiq/xway/dma.c | 9 +++++++--
|
|
1 file changed, 7 insertions(+), 2 deletions(-)
|
|
|
|
--- a/arch/mips/lantiq/xway/dma.c
|
|
+++ b/arch/mips/lantiq/xway/dma.c
|
|
@@ -40,7 +40,11 @@
|
|
#define DMA_IRQ_ACK 0x7e /* IRQ status register */
|
|
#define DMA_POLL BIT(31) /* turn on channel polling */
|
|
#define DMA_CLK_DIV4 BIT(6) /* polling clock divider */
|
|
-#define DMA_2W_BURST BIT(1) /* 2 word burst length */
|
|
+#define DMA_PCTRL_2W_BURST 0x1 /* 2 word burst length */
|
|
+#define DMA_PCTRL_4W_BURST 0x2 /* 4 word burst length */
|
|
+#define DMA_PCTRL_8W_BURST 0x3 /* 8 word burst length */
|
|
+#define DMA_TX_BURST_SHIFT 4 /* tx burst shift */
|
|
+#define DMA_RX_BURST_SHIFT 2 /* rx burst shift */
|
|
#define DMA_ETOP_ENDIANNESS (0xf << 8) /* endianness swap etop channels */
|
|
#define DMA_WEIGHT (BIT(17) | BIT(16)) /* default channel wheight */
|
|
|
|
@@ -191,7 +195,8 @@ ltq_dma_init_port(int p)
|
|
break;
|
|
|
|
case DMA_PORT_DEU:
|
|
- ltq_dma_w32((DMA_2W_BURST << 4) | (DMA_2W_BURST << 2),
|
|
+ ltq_dma_w32((DMA_PCTRL_2W_BURST << DMA_TX_BURST_SHIFT) |
|
|
+ (DMA_PCTRL_2W_BURST << DMA_RX_BURST_SHIFT),
|
|
LTQ_DMA_PCTRL);
|
|
break;
|
|
|